tools/build/check-links.sh

   1 #!/bin/sh
   2 # $FreeBSD$
   3
   4 ret=0
   5 CHECK_UNRESOLVED=1
   6 while getopts "U" flag; do
   7         case "${flag}" in
   8                 U) CHECK_UNRESOLVED=0 ;;
   9         esac
  10 done
  11 shift $((OPTIND-1))
  12
  13 mime=$(file -L --mime-type $1)
  14 case $mime in
  15 *application/x-executable);;
  16 *application/x-sharedlib);;
  17 *) echo "Not an elf file" >&2 ; exit 1;;
  18 esac
  19
  20 # Gather all symbols from the target
  21 unresolved_symbols=$(nm -D -u --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ')
  22 ldd_libs=$(ldd $1 | awk '{print $1 ":" $3}')
  23
  24 libkey() {
  25         libkey="lib_symbols_$1"
  26         patterns=[.+,-]
  27         replacement=_
  28         while :; do
  29                 case " ${libkey} " in
  30                         *${patterns}*)
  31                                 libkey="${libkey%%${patterns}*}${replacement}${libkey#*${patterns}}"
  32                                 ;;
  33                         *)
  34                                 break
  35                                 ;;
  36                 esac
  37         done
  38         return 0
  39 }
  40
  41 # Check for useful libs
  42 list_libs=
  43 resolved_symbols=
  44 for lib in $(readelf -d $1 | awk '$2 ~ /\(?NEEDED\)?/ { sub(/\[/,"",$NF); sub(/\]/,"",$NF); print $NF }'); do
  45         echo -n "checking if $lib is needed: "
  46         for libpair in ${ldd_libs}; do
  47                 case "${libpair}" in
  48                         ${lib}:*) libpath="${libpair#*:}" && break ;;
  49                 esac
  50         done
  51         list_libs="$list_libs $lib"
  52         foundone=
  53         lib_symbols="$(nm -D --defined-only --format=posix "${libpath}" | awk '$2 ~ /R|D|T|W|B|V/ {print $1}' | tr '\n' ' ')"
  54         if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  55                 # Save the global symbols for this lib
  56                 libkey "${lib}"
  57                 setvar "${libkey}"  "${lib_symbols}"
  58         fi
  59         for fct in ${lib_symbols}; do
  60                 case " ${unresolved_symbols} " in
  61                         *\ ${fct}\ *) foundone="${fct}" && break ;;
  62                 esac
  63         done
  64         if [ -n "${foundone}" ]; then
  65                 echo "yes... ${foundone}"
  66         else
  67                 echo "no"
  68                 ret=1
  69         fi
  70 done
  71
  72 if [ ${CHECK_UNRESOLVED} -eq 1 ]; then
  73         for sym in ${unresolved_symbols}; do
  74                 found=0
  75                 for lib in ${list_libs}; do
  76                         libkey "${lib}"
  77                         eval "lib_symbols=\"\${${libkey}}\""
  78                         # lib_symbols now contains symbols for the lib.
  79                         case " ${lib_symbols} " in
  80                                 *\ ${sym}\ *) found=1 && break ;;
  81                         esac
  82                 done
  83                 if [ $found -eq 0 ]; then
  84                         echo "Unresolved symbol $sym"
  85                         ret=1
  86                 fi
  87         done
  88 fi
  89
  90 exit ${ret}